双幅典型断面静力系数气动干扰试验研究  

EXPERIMENTAL STUDY ON AERODYNAMIC INTERFERENCE ON AEROSTATIC COEFFICIENTS OF TWIN REPRESENTATIVE SECTIONS

作　　者：刘小兵[1] 杨群[2] 

机构地区：[1]石家庄铁道大学风工程研究中心,河北石家庄050043 [2]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《工程力学》2012年第A02期107-112,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(50608030)

摘　　要：建立了双幅桥面静力系数气动干扰的定量分析方法,定义干扰因子为双幅桥面的静力系数与单幅桥面的静力系数之比。基于测压风洞试验,针对3种典型断面(矩形断面、Π形断面和流线形断面),对双幅桥面桥梁静力系数气动干扰进行了研究。研究结果表明:静力系数气动干扰主要表现为遮挡作用,下游断面的阻力系数均值小于单幅断面结果。与流线形断面相比,钝体断面(矩形断面和Π形断面)的遮挡作用更明显。A quantitative analysis method of aerodynamic interferences on aerostatic coefficients of twin separated decks was developed. Interference factor （IF） was defined as the ratio of aerostatic coefficient of twin decks to that of single deck. Aerodynamic interferences on aerostatic coefficients of bridges with twin decks were studied using three representative sections （rectangular section, H shaped section and streamlined section） through pressure-measured wind tunnel experiments. The experimental results show that aerodynamic interferences on aerostatic coefficients are mainly attributed to shielding effect. Mean value of drag coefficient of leeward section is smaller than that of single section. Compared with streamlined section, shielding effect on bluff sections （rectangular section and H shaped section） is more significant.

关 键 词：气动干扰 静力系数 双幅典型断面 风洞试验 测压 

分 类 号：TU311.3[建筑科学—结构工程] U441.3[建筑科学—桥梁与隧道工程]